类数据通信网络消息：详细的报头格式和物理地址分配

[中文适用范围]： 本 SAE 推荐实践定义了基于 SAE J1850 B 类网络的汽车串行通信的非诊断消息的标头和数据字段中包含的信息。本文档描述并指定了消息中使用的标头字段@数据字段@字段大小@缩放@表示@和数据位置。无帧内响应的 SAE J1850 消息帧的一般结构如图 1 所示。具有帧内响应的 SAE J1850 消息的结构如图 2 所示。图 1 和图 2 还显示了定义的帧字段的范围对于非诊断消息，请参阅本文档。有关排放相关诊断消息标头和数据字段的规范，请参阅 SAE J1979。有关其他诊断数据字段的定义，请参阅 SAE J2190。 SAE J1850 中给出了网络接口硬件的描述@基本协议定义@电气规范@和CRC字节。 SAE J1850 定义了两种且仅有两种格式的消息头。它们是单字节标头格式和统一标头格式。统一标头格式有两种形式：单字节形式和三字节形式。本文档涵盖了所有这些格式和形式，以识别可在 SAE J1850 网络上发送的消息内容。本文件由四个部分组成，每个部分单独发布。 SAE J2178 第 1 部分（本部分标题为：详细报头格式和物理地址分配）描述了消息报头格式的两种允许形式（单字节和合并）。它还包含汽车典型子系统的物理节点地址范围分配。本文件第 3.1 段更详细地描述了这部分的细节。 SAE J2178 第 2 部分（标题：数据参数定义）定义了可以在 SAE J1850（B 类）网络上交换的标准参数数据。指定参数缩放@范围@和传递函数。 SAE J2178 第 3 部分（标题：单字节形式报头的目标地址）定义了单字节报头格式和统一报头格式的 1 字节形式的消息分配。 SAE J2178 的第 4 部分（标题：三字节标头的目标地址（第二个字节））定义了统一标头格式的三字节形式的消息分配。 [外文原描述]： This SAE Recommended Practice defines the information contained in the header and data fields of non-diagnostic messages for automotive serial communications based on SAE J1850 Class B networks. This document describes and specifies the header fields, data fields, field sizes, scaling, representations, and data positions used within messages.The general structure of a SAE J1850 message frame without in-frame response is shown in Figure 1 . The structure of a SAE J1850 message with in-frame response is shown in Figure 2 . Figures 1 and 2 also show the scope of frame fields defined by this document for non-diagnostic messages. Refer to SAE J1979 for specifications of emissions related diagnostic message header and data fields. Refer to SAE J2190 for the definition of other diagnostic data fields. The description of the network interface hardware, basic protocol definition, the electrical specifications, and the CRC byte are given in SAE J1850.SAE J1850 defines two and only two formats of message headers. They are the Single Byte header format and the Consolidated header format. The Consolidated header format has two forms, a Single Byte form and a three byte form. This document covers all of these formats and forms to identify the contents of messages which could be sent on a SAE J1850 network.This document consists of four parts, each published separately.SAE J2178-1 (Titled: Detailed Header Formats and Physical Address Assignments) describes the two allowed forms of message header formats, Single Byte and Consolidated. It also contains the physical node address range assignments for the typical sub-systems of an automobile.SAE J2178-2 (Titled: Data Parameter Definitions) defines the standard parametric data which may be exchanged on SAE J1850 (Class B) networks. The parameter scaling, ranges, and transfer functions are specified. Messages which refer to these parametric definitions shall always adhere to these parametric definitions. It is intended that at least one of the definitions for each parameter in this part matches the SAE J1979 definition.SAE J2178-3 (Titled: Frame IDs for Single Byte Forms of Headers) defines the message assignments for the single byte header format and the one byte form of the consolidated header format.SAE J2178-4 (Titled: Message Definition for Three Byte Headers) defines the message assignments for the three byte form of the consolidated header format.Cross Reference: ANSI/IEEE754,J1213-1,J1850_201510,J1930_201703,J1979_201202,J1979_201408,J2190